Anything doomy/stonery like great chain of being etc. push those right out to the 1 hour mark and go full dopesmoker with them.

If you listen to enough live recordings you do kinda get some of what you are looking for though, they often string multiple songs together into suites, with extra parts, callbacks, and then reprise back into the first song to finish. last time I saw them they did a fantastic extended Gaia into Gila Monster (pre single release, was very cool) and back into Gaia. and an extended grim reaper with extra rap pulling from other tracks, that was amazing.

The Wheel. C'mon, can you imagine

Man I would kill for a 90 minutes dripping tap, but I don't think the world is ready for something that great yet